Why are all handsets locked and frozen

I have a BT GRAPHITE 2500 QUAD set of phones purchased December 2011.When I turned my electric off for a while on a couple of occasions yesterday the handsets, quite understandably, displayed 'Power cut' and when the electric came on again all was back to normal. After a night's sleep I went to make a call and everything was frozen on all handsets and they displayed 'Power Cut.' followed by 'Set time/date?'. As the keypads are frozen I have no idea what to do! Would you please advise me as to what I do to put matters right. Thank you

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Hi,
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to set the time the instructions are on page 9 of the instruction manual in the getting started section.

in case you no longer have the manual....

1. press the tick/menu button twice.2. press 0 and you hear 'to set the day and time press Star, to hear the day and time press Square.3. press star. you hear 'please enter new day and time after the tone' enter the day (1=sun, 2=mon etc) enter the time using 24hr clock.4. press the X/security button twice to exit.

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This could be due to the fact that one of your phones is off the hook or unplugged. Check and make sure that all devices are operational and charged.. Try applying a warm damply wet cloth on the back when attempting to open the battery cover..Don't forget to check the phone line itseft.
Cheers